/Engine/Source/Runtime/GeometryCore/Public/CompGeom/ConvexDecomposition3.h
Split the worst convex part, and return the increase in the total number of convex parts after splitting (can be more than 1 if result has multiple separate connected components) Note: could return 0 if no splits were possible
int32 SplitWorst ( bool bCanSkipUnreliableGeoVolumes, double ErrorTolerance )